FormSpine

FormSpine is a lightweight (~4kb, ~1.2kb gzipped) JavaScript form library with validation, error handling and fetch (Polyfilled with developit/unfetch)

It's promise-based, which makes running scripts on error/success very easy.

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Table of Contents

• Getting Started
• Usage
• API
• Examples
• Phalange (700 bytes alternative)
• Inspiration

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Getting Started

Install Instructions

Adding FormSpine to your project requires NPM. Optinally you could use Yarn.

Run the following command in your project root:

npm install formspine --save

Or with Yarn:

yarn add formspine

Using In Your Project

Using Rollup or WebPack (or another module bundler), you can do like this:

// ES6
import FormSpine from "formspine";
 
// CommonJS
var FormSpine = require("formspine");

Remember to polyfill Fetch

require("unfetch/polyfill");

It's also on unpkg:

<script src="//unpkg.com/formspine/dist/formspine.umd.js"></script>
 
<script>
var FormSpine = formspine; // to fix name in UMD package, for consistency.
 
new FormSpine('/', {});
</script> 

Please notice that the fetch polyfill is NOT included in the UMD version.

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Usage

Vue.js example

let fields = {
    todo_text: {
        required: true,
        max_length: 50
    }
};
 
new Vue({
    el: "#app",
    data: {
        form: new FormSpine('/create-todo', fields)
    },
    
    methods: {
        submit: function() {
            this.form.post().then(() => alert('Done!'));
        }
    }
});

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API

The FormSpine Class

The FormSpine class is the backbone of FormSpine and the class you'll be using.

Methods

Method	Description	Parameters
post	Sends a POST request to the url specified in the Form object
delete	Sends a DELETE/DESTROY request to the url specified in the Form object
put	Sends a PUT request to the url specified in the Form object
submit	Sends a request with the type specified, to the url specified in the Form object	type: Any request type possible in the fetch api. Example: form.submit('GET')

Parameters

Name	Type	Description	Required	Default
url	string	The url that requests should be send to.	true	''
fields	object	The fields in the form.	true	{}
options	object	An object with additional options	false	{}

FormSpine options parameters

Name	Type	Description	Required	Default
messages	object	Custom error validation messages.	false	{}
resetOnSuccess	boolean	Determines if form fields should be cleared on success.	false	false
headers	object	Adds custom headers to each request	false	{}

url

The url parameter is the first of three parameters, and it defines which url to send requests to upon submitting. It can be an absolute or relative url, such as: /submit or https://your-site.com/send.

fields

The fields that you have in the form should be defined here as an object of objects, keyed by field name. This is also where you define validation rules (if any)

Example:

let fields = {
    username: {
        required: true
    },
    
    password: {
        required: true,
        min_length: 6,
        must_match: "password_confirmation"
    },
    
    password_confirmation: {
        required: true
    }
};
 
// Init form
let formObject = new FormSpine('/submit', fields);

Possible field attributes are:

Name	Type	Description	Default
value	string	The initial value of the field	''
name	string	The field name used in error messages (:field)	object key name
required	boolean	Validation rule: determines if field is required	false
min_length	integer	Validation rule: sets a minimum length for the field
max_length	integer	Validation rule: sets a maximum length for the field
no_digits	boolean	Validation rule: may not contain digits	false
only_digits	boolean	Validation rule: may only contain digits	false
checked	boolean	Validation rule: has to be checked / be true (for checkbox/radio inputs)	false
must_match	string	Validation rule: has to match another field (good for password confirmations)	``
regex	string/regex	Validation rule: must match regex

messages

This parameter is useful if you want to translate or change the validation messages. You have to pass in an object of strings with error messages.

Example (Using defaults):

let customMessages = {
    checked:      "The :field must be checked.",
    regex:        "The :field field is invalid.",
    required:     "The :field field is required.",
    no_digits:    "The :field field may not contain digits.",
    only_digits:  "The :field field may only contain digits.",
    must_match:   "The :field field match the :must_match field.",
    min_length:   "The :field field must be at least :min_length characters.",
    max_length:   "The :field field must not be longer than :max_length characters."
};
 
// Init form
let formObject = new FormSpine('/submit', {}, { messages: customMessages });

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Examples

Vue Demo

Preact Demo

Angular Demo

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Phalange

Don't care about client-side validation, and does every byte count? How about using Phalange?

It's a ~0.7kb version of FormSpine, without the Validation library. It still handles errors, but will not validate fields.

Get Phalange here

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Inspiration

I found myself creating similar classes for every new project I started, so I felt it was time to combine everything into a single class that I could use for almost all my projects. Of cause, in the nature of sharing, I decided to open source it.

FormSpine is inspired heavily on laracasts/vue-forms

If you're into learning, you should really go signup at Laracasts

Build scripts (and more) are heavily based on developit/unfetch.